[lively-kernel] How to add a property to a morph visually

[Milan Zimmermann]

Hi:

I am trying to build a quick extremely simple library management application.

Something I am missing that is likely due to my lack of Lively skills:
I create a Morph and call it "Library Application" in the World. I'd
like to add to it a member called "books" which would be a list. Is
there a way to do it visually, apart from creating the Library
Application as a Morph extension with the books member?

(I am afraid following this I have more - naive - questions. Sorry for
the noise...)

Thanks

milan